Synchronization system and method for transmission and reception in audible frequency range-based sound communication, and apparatus applied thereto

Abstract

Provided is a synchronization system and method for acoustic communication in audible frequency range, and an apparatus applied thereto. The synchronization system for acoustic communication in audible frequency range is configured to prevent deterioration of a synchronization performance and to reduce an amount of calculation by calculating a correlation based on a few samples as opposed to calculating a correlation for each sample when a receiver of the acoustic communication performs synchronization while the acoustic communication is performed in the audible frequency range through modification of an audio signal or adding of a predetermined signal to an audio signal.

Description

TECHNICAL FIELD[0001]The present invention relates to acoustic communication, and more particularly, to a synchronization system and method, and an apparatus applied thereto, which may improve a synchronization performance and may reduce an amount of calculation by calculating a correlation value with respect to a few samples instead of each sample when a receiver of the acoustic communication performs synchronization while the acoustic communication is performed in the audible frequency range through modification of an audio signal or adding of a predetermined signal to an audio signal.BACKGROUND[0002]It has been developed that transforms an audio signal corresponding to a time-domain signal into a frequency-domain signal based on a modified complex lapped transform (MCLT), and that inserts synchronization data by changing a phase of a frequency coefficient.[0003]The synchronization data may be a predetermined value which is shared with a receiver, and may consist of ‘0’ and ‘1’. I...

AI Technical Summary

Benefits of technology

[0024]Therefore, in accordance with an aspect of the present invention, deterioration of a synchronization performance can be prevented and an amount of calculation can be reduced by calculating a correlation value based on a few samples as opposed to calculating a correlation value for each sample when a receiver of the acoustic communication performs synchronization while the acoustic communication is performed in the audible frequency range through modification of an audio signal or adding of a predetermined signal to an audio signal.

[0025]Accordingly, a drawback in providing an acoustic communication service in an audible frequency range may be overcame.

Problems solved by technology

However, the receiver may be required to perform a large amount of calculation to calculate the MCLT coefficient for each sample.

Although a fast Fourier transform (FFT) may be used to reduce the amount of calculation, this method still requires a large amount of calculation since a coefficient should be calculated for each sample.

Also, a method of calculating an approximate correlation may be utilized to reduce an amount of calculation, but the method has a drawback in that performance of synchronization is deteriorated.

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